I don't know where to put the alpha texture in, how do I get rid of the black boxes?
Edit: For anyone else who decides to get this pack. If you get black boxes on the guns, open the "Retro_Gun_Diff.jpg" in gimp or drawing software like krita and erase out the grey back ground from the image and then export it as a png. Then put the the image in the base map slot and it should look normal. Also make sure to set the "Render Face" to Both and not Front. Otherwise only one side of the texture will be shown. Also make sure you're using the Rigs and not Models. The guns look nice btw. 
